Доступ предоставлен для: Guest
Главная ICHMT DL Текущий год Архив Исполнительный Комитет ICHMT

OPTIMIZATION STUDY OF TUBE BUNDLE IN CROSS-FLOW FOR DIFFERENT TUBE SHAPES IN A BOILER

DOI: 10.1615/ICHMT.2014.IntSympConvHeatMassTransf.950
pages 1275-1282

Najla El Gharbi
Universite de Lorraine, IUT Henri Poincare de Longwy, 186 rue de Lorraine, 54400 Longwy - Cosnes et Romain, France ; USTHB, PB 32 El Alia Bab Ezzouar 16111 Alger, Algerie

Mohammed El Ganaoui
Sciences des Procedes Ceramiques et des Traitements de Surface (SPCTS), UMR CNRS 6638, Faculte des Sciences de Limoges 123, av. A. Thomas - 87060 Limoges Cedex

Аннотация

A circular tube bundle is one of the simplest geometries and widely used in heat transfer applications, but in the recent years, cross-flow heat exchanger with non-circular tube arrangement is receiving increased attention. The main purpose of this work is to gain insight into the local heat transfer and fluid flow conditions in different tube bundles arrangement: circular, ellipsoidal and wing-shaped, for heat exchangers in boiler. All tube shapes are investigated under similar operating condition. The investigation covers the effects of minor-to-major axis ratios and flow angles of attack. A two-dimensional (2D) numerical CFD model using finite volume discretization was conducted to evaluate the boiler system performance. The results indicated that, for certain tubeshapes, increasing the angle of attack 90° enhance the convective heat transfer coefficient considerably. The overall best thermal performance was seen in the elliptic tube heat exchanger and it was qualified with the lower axis ratio and angle of attack. Thus, we can propose elliptic tubes for heat exchangers in boilers.

ICHMT Digital Library

Bow shocks on a jet-like solid body shape. Thermal Sciences 2004, 2004. Pulsed, supersonic fuel jets - their characteristics and potential for improved diesel engine injection. PULSED, SUPERSONIC FUEL JETS - THEIR CHARACTERISTICS AND POTENTIAL FOR IMPROVED DIESEL ENGINE INJECTION
View of engine compartment components (left). Plots of temperature distributions in centreplane, forward of engine (right). CHT-04 - Advances in Computational Heat Transfer III, 2004. Devel... DEVELOPMENT AND CURRENT STATUS OF INDUSTRIAL THERMOFLUIDS CFD ANALYSIS
Pratt & Whitney's F-135 Joint Strike Fighter Engine under test in Florida is a 3600F class jet engine. TURBINE-09, 2009. Turbine airfoil leading edge stagnation aerodynamics and heat transfe... TURBINE AIRFOIL LEADING EDGE STAGNATION AERODYNAMICS AND HEAT TRANSFER - A REVIEW
Refractive index reconstructed field. (a) Second iteration. (b) Fourth iteration. Radiative Transfer - VI, 2010. Theoretical development for refractive index reconstruction from a radiative ... THEORETICAL DEVELOPMENT FOR REFRACTIVE INDEX RECONSTRUCTION FROM A RADIATIVE TRANSFER EQUATION-BASED ALGORITHM
Two inclusion test, four collimated sources. Radiative Transfer - VI, 2010. New developments in frequency domain optical tomography. Part II. Application with a L-BFGS associated to an inexa... NEW DEVELOPMENTS IN FREQUENCY DOMAIN OPTICAL TOMOGRAPHY. PART II. APPLICATION WITH A L-BFGS ASSOCIATED TO AN INEXACT LINE SEARCH